Canon EOS 550D 用户手册

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页码 260
197
3
 Custom Function SettingsN
C.Fn-12
Add image verification data
0: Disable
1: Enable
Data for verifying whether the image is original or not is appended to the 
image automatically. When the shooting information of an image 
appended with the verification data is displayed (p.173), the <L> icon 
will appear.
To verify whether the image is original, the Original Data Security Kit 
OSK-E3 (sold separately) is required.
The images are not compatible with the image encryption/decryption 
features of Original Data Security Kit OSK-E3.
COP
Y